Clipboard or terminal scrollback mnemonic vulnerability

[valefar-on-discord]

Forward from

• [ToB Audit] #1: Generated mnemonic could be leaked (via clipboard or terminal scrollback) ethereum/staking-deposit-cli#97

The 2020 Audit of staking-deposit-cli mentioned a task to properly clear the terminal buffer and clipboard to prevent the possibility of leaking the mnemonic. This was investigated by Carl and he has concerns around cross-platform solutions.

Ultimately it may not be possible to resolve this for every usecase but something that should be investigated as is a likely output from any future audit.

[remyroy]

Using of the the flag where you input a mnemonic or a password from the CLI could also be an interesting case where most CLI or shells have a feature to store the history of commands in a file somewhere. I'm not sure we can do a lot beside just warning about it.

[remyroy]

My last comment is probably more related to #33